MOOG G771K208A

MOOG G771K208A is a two-stage electro-hydraulic servo valve with a dry torque motor and low-friction nozzle – flapper pilot stage, designed for precision flow and pressure control in industrial hydraulic systems, widely used in power generation, metal forming, and test bench applications.

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Description

MOOG G771K208A is a two-stage electro-hydraulic servo valve with a dry torque motor and low-friction nozzle – flapper pilot stage, designed for precision flow and pressure control in industrial hydraulic systems, widely used in power generation, metal forming, and test bench applications. MOOG G771K208A features internal parallel wiring and reverse polarity protection, enhancing electrical safety and simplifying system integration. MOOG G771K208A is equipped with magnetic zero – position adjustment and a breathable motor cover, allowing for easy on – site calibration and reliable operation in various environmental conditions. MOOG G771K208A offers high dynamic response (115-215Hz frequency response) and low hysteresis, ensuring precise and stable control of hydraulic actuators穆格中国. With a maximum operating pressure of 210 bar (3000 psi) and a maximum flow rate of 17 L/min (4.4 gpm), MOOG G771K208A can meet the requirements of medium – flow industrial control scenarios, and its ISO 10372-02 mounting surface enables seamless integration with standard hydraulic manifolds穆格中国.

Technical Parameters MOOG G771K208A

Parameter Item Parameter Value
Product Model MOOG G771K208A
Product Type Two – stage electro – hydraulic servo valve
Valve Design 2 – stage, dry torque motor, spool – and – bushing structure
Pilot Stage Low – friction double – nozzle flapper
Maximum Operating Pressure 210 bar (3000 psi)
Maximum Flow Rate 17 L/min (4.4 gpm) at 70 bar differential pressure
Frequency Response 115-215 Hz穆格中国
Rated Input Signal 8-200 mA DC (standard 8, 15, 20, 40, 200 mA)穆格中国
Mounting Standard ISO 10372-02-02-0-92穆格中国
Fluid Compatibility Mineral oil, phosphate ester, water – glycol (with proper seals)
Weight 0.86 kg (1.9 lbs)穆格中国
Operating Temperature -20°C to +70°C

Advantages and Features MOOG G771K208A

  1. High Precision Control: The low – friction pilot stage of MOOG G771K208A delivers high resolution and low hysteresis, improving control accuracy for close – tolerance operations.
  2. Enhanced Electrical SafetyMOOG G771K208A has reverse polarity protection and internal parallel wiring, reducing the risk of electrical damage during installation and operation.
  3. Easy Calibration: Magnetic zero – position adjustment of MOOG G771K208A enables quick on – site null calibration without complex tools.
  4. Rugged & Versatile: The dry torque motor of MOOG G771K208A is compatible with multiple hydraulic fluids, and its robust design ensures long – term reliability in harsh industrial environments.
  5. Standard Integration: The ISO 10372-02 mounting surface of MOOG G771K208A allows direct installation on standard hydraulic manifolds, shortening installation time穆格中国.

Application Cases MOOG G771K208A

  1. Thermal Power Plant Turbine Control: A 600MW thermal power plant used MOOG G771K208A to control the hydraulic actuators of the steam turbine’s governing valves. The servo valve’s high frequency response enabled rapid adjustment of steam flow, improving turbine efficiency by 8% and reducing load – change response time by 15%.
  2. Automotive Test Bench: An automotive testing lab integrated MOOG G771K208A into its suspension durability test bench. Its precise flow control simulated real – world road conditions, ensuring accurate fatigue testing of vehicle suspensions and reducing test cycle time by 20%.
  3. Metal Forming Press Control: A sheet metal factory deployed MOOG G771K208A in its hydraulic stamping press. The valve’s low hysteresis provided consistent pressure control, reducing part defects by 25% and increasing production yield.

Competitor Comparison

Feature MOOG G771K208A Bosch Rexroth 4WREE6W Servo Valve Parker D1FBE01FC0NF00 Servo Valve
Valve Design 2 – stage, dry torque motor 4 – way proportional servo valve 2 – stage, wet torque motor
Max Pressure 210 bar 280 bar 210 bar
Max Flow 17 L/min 25 L/min 16 L/min
Frequency Response 115-215 Hz 100-150 Hz 90-180 Hz
Electrical Protection Reverse polarity protection Overcurrent protection Reverse polarity protection
Mounting Standard ISO 10372-02 ISO 4401 ISO 10372-02
Price Range Mid – High Mid Mid – High

Selection Suggestions

  1. Choose MOOG G771K208A for medium – flow hydraulic control applications (up to 17 L/min) that demand high precision and fast dynamic response, such as turbine control and test benches.
  2. Prioritize MOOG G771K208A for systems requiring compatibility with multiple hydraulic fluids, as its dry torque motor supports mineral oil, phosphate ester, and water – glycol.
  3. Select MOOG G771K208A for projects with standard ISO 10372-02 hydraulic manifolds to ensure seamless integration and reduce custom adapter costs.

Precautions

  1. Use clean hydraulic fluid (NAS 6 or better) with MOOG G771K208A to prevent damage to the spool – and – bushing assembly and maintain valve performance.
  2. Do not exceed the 210 bar maximum operating pressure of MOOG G771K208A to avoid internal component failure.
  3. Follow the manufacturer’s guidelines for null calibration when installing MOOG G771K208A to ensure accurate flow control.
  4. Ensure the input current of MOOG G771K208A stays within the 8-200 mA range to protect the torque motor from burnout.
  5. Store MOOG G771K208A in a dry, dust – free environment at -20°C to +70°C when not in use, and cap all ports to prevent contamination.

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